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yarekGmail

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java: simple array question

Hello experts;

I have this
Object[] params

I would like to add a parameter at the end
params[params.length]="extra"

But I got an error.
How to add a new item in the params ?
Avatar of ksivananth
ksivananth
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try

params[params.length - 1]="extra"
Avatar of yarekGmail
yarekGmail

ASKER

No !
I need to ADD a new value, not to replace the last element !
and you have to set the size before setting value,

Object[] params = new Object[size] ;
you have resize array if you want to add!
you better use some collectionlike ArrayList to avoid these hassles!
5 answers and no one fits my needs...

this is my function
public boolean appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
params[params.length] = "new value"; //gives me an error since the params needs to be resized
}
>>//gives me an error since the params needs to be resized

see my comment #34869865

>>5 answers and no one fits my needs...

how? did u try my suggestions?

>>this is my function

the resize would allow u to add a new value but you can't expect that reflected in the caller. for that you need to deal with ArrayList as I told earlier!

You have to use  a new array, see below

better to use ArrayLists

this is my function
public boolean appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
params[params.length] = "new value"; //gives me an error since the params needs to be resized
Object [] params1 = new Object[params.length+1];
for(int j =0; j<params.length; j++){
prams1[j]=params[j];

}
params1[params.length] = "extra";
}


of couse this operator which gives error should be removed:


public boolean appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
//params[params.length] = "new value"; //gives me an error since the params needs to be resized
Object [] params1 = new Object[params.length+1];
for(int j =0; j<params.length; j++){
prams1[j]=params[j];

}
params1[params.length] = "extra";
}




And you return this new array:
public Object[] appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
//params[params.length] = "new value"; //gives me an error since the params needs to be resized
Object [] params1 = new Object[params.length+1];
for(int j =0; j<params.length; j++){
prams1[j]=params[j];

}
params1[params.length] = "extra";

return params1;
}
Avatar of Mick Barry
following explains resizing an array which you'll need to do before adding the element
http://helpdesk.objects.com.au/java/how-do-i-resize-a-java-array
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for_yan
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